We will be seeing hotter weather in the next few days, weeks and months. Strong hives will have bees hanging on the landing and face of the hive. They do this to reduce the temperature inside the hive. Too high temperatures are hard on the brood. They will also be fanning at the entrance to move cool air through the hive. The large groups on bees on the face and landing board are call bearding. It is normal behavior. Bearding usually occurs in late afternoon or early at night when the field bees return. During the night as air temperatures fall most bees usually re-enter the hive.
Photo of fanning. Heads pointed in, tails out. You can hear the hum of beating wing,
If you want to help the bees you can place a small piece of wood between the edges of the outer and inner covers. By breaking the seal between the outer and inner cover hot air in the hive can rise through the center hole of the inner cover and exit through the gap you created. I usually use a small of scrap 1/4 or 3/8 inch plywood to raise the outer cover. A piece about 2 by 6 inches placed at the front of the hive will tilt the outer slightly.
Here you can see the small piece of wood installed and creating a gap between the outer and inner covers.
Some beekeepers use a slatted bottom board to reduce bearding.
Bees also use water to provide evaporative cooling for the hive. Hives should be within a 100 yards of a water source. If you place a water source in your apiary make sure there are enough floating objects the bees can land on so they don't drown.
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